ancient history vs history

ancient history and history both are nouns.

Word	Noun	Adjective	Verb	Adverb
ancient history	Yes	No	No	No
history	Yes	No	No	No

As nouns, history is a hypernym of ancient history; that is, history is a word with a broader meaning than ancient history:

Other hypernyms of ancient history include account, chronicle, story.

ancient history (noun)	history (noun)
knowledge of some recent fact or event that has become so commonly known that it has lost its original pertinence	the discipline that records and interprets past events involving human beings
a history of the ancient world	all that is remembered of the past as preserved in writing; a body of knowledge
	a record or narrative description of past events
	the aggregate of past events
	the continuum of events occurring in succession leading from the past to the present and even into the future